CN109633759A - Ground magnetic resonance signal rapidly extracting device and method based on phase lock amplifying technology - Google Patents
Ground magnetic resonance signal rapidly extracting device and method based on phase lock amplifying technology Download PDFInfo
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- CN109633759A CN109633759A CN201811516744.3A CN201811516744A CN109633759A CN 109633759 A CN109633759 A CN 109633759A CN 201811516744 A CN201811516744 A CN 201811516744A CN 109633759 A CN109633759 A CN 109633759A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/14—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electron or nuclear magnetic resonance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The present invention relates to nuclear magnetic resonance underground water detection technology fields, particularly the ground magnetic resonance signal rapidly extracting device and method to be a kind of based on phase lock amplifying technology, comprising: receiving coil, the magnetic resonance signal that induction underground water generates；Bandwidth 200Hz regulable center frequency bandpass filter, adjusting centre frequency by main control module is Larmor frequency, and receives magnetic resonance signal；Main control module control signal generator generates the cosine signal with Larmor frequency, which realizes frequency change by same phase channel as reference signal and the output signal of bandwidth 200Hz regulable center frequency bandpass filter；Main control module control signal generator generates the cosine signal with Larmor frequency, sinusoidal signal is converted to using 90 ° of phase shifters, which realizes frequency change by orthogonal channel as the output signal of reference signal and bandwidth 200Hz regulable center frequency bandpass filter；Rapidly extracting can be achieved.
Description
Technical field
The present invention relates to nuclear magnetic resonance underground water detection technology fields, are particularly based on phase lock amplifying technology for one kind
Ground magnetic resonance signal rapidly extracting device and method.
Background technique
Ground mr techniques can direct detection underground water, and have the advantages that qualitative, quantitative detection.However ground magnetic
Resonance signal is extremely faint, only receives and lies prostrate grade, vulnerable to noise jamming, noise is relatively low.Especially in man-made noise serious interference
Region, it may appear that amplifier saturation, the problem of useful signal can not be extracted.
" nuclear magnetic resonance underground water detection system and detection method with reference coil " disclosed in CN102053280A, but
This method can only eliminate the industrial frequency harmonic noise with correlation, and structure of the de-noising effect by two coils, paving location
It is influenced with noise mutability very big.
" a kind of nuclear magnetic resonance underground water detectable signal noise cancellation method based on ICA " disclosed in CN104614778A,
This method weakens random noise using ICA algorithm.But in actual noise environment, it is difficult to realize the reliable pressure to coloured noise
System.
" a kind of based on the magnetic resonance noise-eliminating method for modeling anti-recovery technology " disclosed in CN108254794A, this method utilizes
Extremely narrow low-pass filtering suppresses noise, restores original signal by later period Laplce and derivation transformation.But since this method exists
The problem of being realized on software, acquisition device amplifier can not be inhibited to be saturated, and data operation complicated difficult is in the embedded system of on piece
System realizes the rapidly extracting of signal.
Currently, the denoising algorithm of traditional detection NMR signal is mostly to carry out denoising for single noise, it can not
Successfully manage the complex environment noise of real work.In addition, above-mentioned three kinds of methods can not all inhibit acquisition device amplifier to be saturated
The problem of, and be all subsequent software de-noising, it can not real-time live extraction signal.Therefore, research has the function of anti-saturation, and can be
The new technology that field work scene rapidly extracting goes out ground magnetic resonance signal is of great significance.
Summary of the invention
Technical problem to be solved by the present invention lies on the one hand providing, a kind of ground magnetic based on phase lock amplifying technology is total
Shake signal rapidly extracting device, on the other hand provides a kind of ground magnetic resonance signal rapidly extracting side based on phase lock amplifying technology
Method.
The invention is realized in this way a kind of ground magnetic resonance signal rapidly extracting device based on phase lock amplifying technology,
The device includes: receiving coil, bandwidth 200Hz regulable center frequency bandpass filter, signal generator, 90 ° of phase shifters, same to phase
Channel, orthogonal channel and main control module；
The receiving coil, the magnetic resonance signal that induction underground water generates；
The bandwidth 200Hz regulable center frequency bandpass filter, adjusting centre frequency by main control module is Larmor
Frequency, and receive magnetic resonance signal；
The main control module control signal generator generates the cosine signal with Larmor frequency, the signal conduct
Reference signal and the output signal of bandwidth 200Hz regulable center frequency bandpass filter realize frequency change by same phase channel；
The main control module control signal generator generates the cosine signal with Larmor frequency, using 90 °
Phase shifter is converted to sinusoidal signal, and the signal is defeated as reference signal and bandwidth 200Hz regulable center frequency bandpass filter
Signal realizes frequency change by orthogonal channel out；
The main control module acquisition extracts ground magnetic resonance signal with the signal in phase channel and orthogonal channel.
Further, further includes: LC matching network and preamplifier, the LC matching network receive receiving coil
Magnetic resonance signal, realization resonance suppress noise jamming to improve signal amplitude；
The preamplifier carries out first time amplification to via LC matching network signal, and amplified signal is transmitted
To bandwidth 200Hz regulable center frequency bandpass filter.
Further, the same phase channel includes that the first multiplier and the first low-pass filter form orthogonal vector type locking phase
Amplifier and with phase two-stage amplifier, reception bandwidth 200Hz regulable center frequency bandpass filter, while being sent out with the signal
Raw device connection, the output signal of the cosine signal and bandwidth 200Hz regulable center frequency bandpass filter of Larmor frequency pass through
First multiplier realizes frequency change, high fdrequency component and most of noise is eliminated using the first low-pass filter, by described
It is further amplified with phase two-stage amplifier.
Further, the orthogonal channel includes that the second multiplier and the second low-pass filter form orthogonal vector type locking phase
Amplifier and orthogonal two-stage amplifier, the cosine signal with Larmor frequency, are converted to sinusoidal letter by 90 ° of phase shifters
Number, which passes through the second multiplication as reference signal and the output signal of bandwidth 200Hz regulable center frequency bandpass filter
Device realizes frequency change, eliminates high fdrequency component and most of noise using the second low-pass filter, is amplified by orthogonal second level
Device is further amplified.
It further, further include A/D capture card, the main control module control A/D capture card obtains the signal with phase channel,
Collect the initial data in same phase channel；The signal for controlling A/D capture card Acquisition channel, collects the original number of orthogonal channel
According to.
Further, it is 20Hz's that first low-pass filter and second low-pass filter, which are all made of cutoff frequency,
Low-pass first order filter.
Further, second low-pass filter is all made of the low-pass first order filter that cutoff frequency is 20Hz.
A kind of ground magnetic resonance signal rapid extracting method based on phase lock amplifying technology, which comprises
The magnetic resonance signal that underground water generates is incuded by receiving coil；
For magnetic resonance signal via bandwidth 200Hz regulable center frequency bandpass filter, the centre frequency is Larmor's frequency
Rate；
The cosine signal with Larmor frequency is generated, the signal is as reference signal and the center bandwidth 200Hz frequency
The output signal of rate variable band-pass filter realizes frequency change by same phase channel；
The cosine signal with Larmor frequency is generated, is converted to sinusoidal signal using 90 ° of phase shifts, which makees
Realize that frequency is removed by orthogonal channel for reference signal and the output signal of bandwidth 200Hz regulable center frequency bandpass filter
It moves；
The signal with phase channel and orthogonal channel is acquired, ground magnetic resonance signal is extracted.
Further, the initial data formula with phase channel is expressed as
When acquisition time is greater than 10ms, exp (- t/T2*)>>exp(-ωcT), the initial data in the same phase channel of acquisition
Simplification of a formula is
Logarithm is asked to above formula, obtains linear equation
T is sought by linear equation slope k2*=- 1/k, then it is primary by vertical intercept I (0) the acquisition binary of linear equation
Equation:
Similarly, a linear equation in two unknowns of the orthogonal channel obtained:
Q (0) is the vertical intercept that orthogonal channel seeks the linear equation after logarithm, and equation group is established in simultaneous formula (4) and (5),
Seek initial amplitude E0And phase theta.
Compared with prior art, the present invention beneficial effect is:
(1) the ground magnetic resonance signal rapidly extracting device and method provided by the invention based on phase lock amplifying technology,
The data obtained by orthogonal channel with same phase channel can realize that real-time live extracts signal through too low operand.
(2) the ground magnetic resonance signal rapidly extracting device provided by the invention based on phase lock amplifying technology is matched using LC
While network improves detection sensitivity, solve the problems, such as that preamplifier is saturated；
(3) the ground magnetic resonance signal rapidly extracting device provided by the invention based on phase lock amplifying technology, using multistage
Hardware filtering, the first and second low-pass filters for being based especially on low cutoff frequency can effectively inhibit two-stage amplifier full
With, and can be realized the abundant amplification of two-stage amplifier, without the A/D capture card using high conversion digit, reduce costs；
Additional aspect and advantage of the invention will become obviously in the following description, or practice understanding through the invention
It arrives.
Detailed description of the invention
Fig. 1 is the ground magnetic resonance signal rapidly extracting device provided in an embodiment of the present invention based on phase lock amplifying technology；
Fig. 2 is the schematic diagram of main control module of the invention.
Fig. 3 is the circuit diagram of LC matching network of the invention.
Fig. 4 is one embodiment of the invention test device.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
A kind of ground magnetic resonance signal rapidly extracting device based on phase lock amplifying technology of the invention is shown referring to Fig. 1
Schematic block diagram；A kind of ground magnetic resonance signal rapidly extracting device based on phase lock amplifying technology, which includes: reception line
Circle, LC matching network, preamplifier, bandwidth 200Hz regulable center frequency bandpass filter, signal generator, 90 ° of phase shifts
Device, the first multiplier, the second multiplier, the first low-pass filter, the second low-pass filter, with phase two-stage amplifier, orthogonal two
Grade amplifier, A/D capture card, main control module.
The schematic block diagram of main control module of the invention is shown referring to fig. 2；Main control module includes DSP module, FPGA module,
Key, display.
Wherein, receiving coil 1 is connect through LC matching network 2 with preamplifier 3 in connection relationship, preamplifier 3
It is connect respectively with the first multiplier 7 and the second multiplier 8 through bandwidth 200Hz regulable center frequency bandpass filter 4, the first multiplication
Device 7 is connect through the first low-pass filter 9 with same phase two-stage amplifier 11, and the second multiplier 8 is through the second low-pass filter 10 and just
It hands over two-stage amplifier 12 to connect, is connect respectively with A/D capture card 13 with phase two-stage amplifier 11 and orthogonal two-stage amplifier 12, A/
D capture card 13 is connect with signal generator 5 and wide 200Hz regulable center frequency bandpass filter 4 respectively through main control module 14, letter
Number generator 5 is connect with the first multiplier 7 and 90 ° phase shifter 6 respectively, and 90 ° of phase shifters 6 are connect with the second multiplier 8, DSP mould
Block 15 is connected with FPGA module 16, key 17 and display 18 respectively.
Receiving coil 1, the magnetic resonance signal that induction underground water generates, and the signal is transmitted to LC matching network 2；
Show the circuit diagram of LC matching network of the invention referring to Fig. 3, the LC matching network 2 by matching capacitance C and
LC passive filter is constituted, and LC passive filter is 3 rank Π mode filters being made of L1, C1, L2, C2, L3, C3, matching electricity
Hold and realize resonance with receiving coil to improve signal amplitude, LC passive filter suppresses noise jamming to prevent preamplifier 3
Saturation；
The preamplifier 3 carries out first time amplification to signal, and amplified signal is transmitted to bandwidth 200Hz
Regulable center frequency bandpass filter 4；
The bandwidth 200Hz regulable center frequency bandpass filter 4 is a regulable center frequency, bandwidth 200Hz
Bandpass filter, centre frequency by main control module 14 adjust, be adjusted to Larmor frequency, the bandwidth of 200Hz ensures can not
The acquisition ground magnetic resonance signal of distortion, further suppresses noise；
The same Xiang Tongdao of first multiplier 7 and the first low-pass filter 9 composition orthogonal vector type lock-in amplifier,
Main control module 14 generates the cosine signal with Larmor frequency by control signal generator 5, and the signal is as reference
The output signal of signal and bandwidth 200Hz regulable center frequency bandpass filter 4 realizes frequency change by the first multiplier, then
By 9 de-noising high fdrequency component of the first low-pass filter and most of noise, finally, main control module control A/D capture card 13 obtains
Signal after being further amplified with phase two-stage amplifier 11 collects the initial data in same phase channel；
The positive traffic of second multiplier 8 and the second low-pass filter 10 composition orthogonal vector type lock-in amplifier
Road, main control module 14 generate the cosine signal with Larmor frequency by control signal generator 5, move using 90 °
Phase device 6 is converted to sinusoidal signal, and the signal is defeated as reference signal and bandwidth 200Hz regulable center frequency bandpass filter 4
Signal realizes frequency change by the second multiplier 8 out, using 10 de-noising high fdrequency component of the second low-pass filter and major part
Noise acquires finally, main control module control A/D capture card 13 obtains the signal after orthogonal two-stage amplifier 12 is further amplified
To the initial data of orthogonal channel；
First low-pass filter 9 and the second low-pass filter 10 are all made of the first-order low-pass wave that cutoff frequency is 20Hz
Device, since free transmission range is smaller, out-of-band noise and signal are all effectively filtered out, and efficiently solve two-stage amplifier saturation
Problem, and by low-pass filter output signal be mainly made of ground magnetic resonance signal, can by two-stage amplifier into
One step is amplified to the range that low conversion digit A/D can be identified, further reduced installation cost.
Main control module 14 is made of DSP module 15, FPGA module 16, key 17 and display 18, by key 17 and is shown
Show that device 18 realizes human-computer interaction, other than completing above-mentioned regulation work, a kind of ground magnetic resonance letter based on phase lock amplifying technology
What number rapid extracting method was realized on main control module 14, the initial data to the same phase channel of acquisition and orthogonal channel in real time
Initial data is handled with rapidly extracting signal, and the signal of extraction is shown on display 18.
A kind of ground magnetic resonance signal rapid extracting method based on phase lock amplifying technology, which comprises
The magnetic resonance signal that underground water generates is incuded by receiving coil；
For magnetic resonance signal via bandwidth 200Hz regulable center frequency bandpass filter, the centre frequency is Larmor's frequency
Rate；
The cosine signal with Larmor frequency is generated, the signal is as reference signal and the center bandwidth 200Hz frequency
The output signal of rate variable band-pass filter realizes frequency change by same phase channel；
The cosine signal with Larmor frequency is generated, is converted to sinusoidal signal using 90 ° of phase shifts, which makees
Realize that frequency is removed by orthogonal channel for reference signal and the output signal of bandwidth 200Hz regulable center frequency bandpass filter
It moves；
The signal with phase channel and orthogonal channel is acquired, ground magnetic resonance signal is extracted.
Initial data formula with phase channel is represented by
Three key parameters of magnetic resonance signal include initial amplitude E0, mean time of relaxation T2* and phase theta, since magnetic is total
Shake 30≤T of signal averaging relaxation time2*≤1000ms, i.e. 1 < 1/T2* < 33.3, and the cutoff frequency of low-pass filter is 20Hz,
Corresponding cut-off angular frequency is ωc=125.65rad/s, when acquisition time is greater than 10ms, exp (- t/T2*)>>exp(-ωcT), the initial data formula in the same phase channel acquired at this time can abbreviation be
Logarithm is asked to above formula, obtains linear equation
Firstly, T can be sought by linear equation slope k2*=- 1/k, then obtained by the vertical intercept I (0) of linear equation
Obtain linear equation in two unknowns
Similarly, an also linear equation in two unknowns of available orthogonal channel
Q (0) is the vertical intercept that orthogonal channel seeks the linear equation after logarithm, and equation group is established in simultaneous formula (4) and (5),
It can seek E0And phase theta, i.e., effective ground magnetic resonance signal is quickly proposed by simple computation.
Embodiment:
The ground magnetic resonance proposed by the invention based on phase lock amplifying technology is believed using measuring device as shown in Figure 4
Number rapidly extracting device and method is tested.Programmed signal source generates an E by voltage attenuator in signal coil0
=200nV, fL=2000Hz, T2* the artificial magnetic resonance signal in=θ=30 ° 150ms and, expression formula are e (t)=200exp
(- t/0.15) cos (2 π × 2000 × t+30 °), since receiving coil and signal coil are placed in parallel, and the same the number of turns of use,
Line footpath and structure, so equally having coupled an identical magnetic resonance signal in receiving coil, while receiving coil coupling is empty
Between electromagnetic noise, controller by synchronizer trigger start programmed signal source output signal while, starting the present invention is mentioned
Rapidly extracting device out.
It is f that adjustment signal generator and the reference signal of 90 ° of phase shifters output, which are respectively frequency,L=2000Hz cosine signal
And sinusoidal signal, the order 1 and cut-off angular frequency ω of two low-pass filtersc=125.67rad/s.Scene display extracts
Magnetic resonance signal key parameter, as a result E0=194.65nV, T2*=θ=29.32 ° 152.78ms and, with original signal
Compared to E0,T2* it is 97.32%, 98.14% and 97.73% respectively with the precision of θ, obtains useful signal, and can be real-time
It handles and shows result.
Claims (9)
1. a kind of ground magnetic resonance signal rapidly extracting device based on phase lock amplifying technology, which is characterized in that the device includes:
Receiving coil, bandwidth 200Hz regulable center frequency bandpass filter, signal generator, 90 ° of phase shifters, same to Xiang Tongdao, positive traffic
Road and main control module；
The receiving coil, the magnetic resonance signal that induction underground water generates；
The bandwidth 200Hz regulable center frequency bandpass filter, adjusting centre frequency by main control module is Larmor frequency,
And receive magnetic resonance signal；
The main control module control signal generator generates the cosine signal with Larmor frequency, and the signal is as reference
The output signal of signal and bandwidth 200Hz regulable center frequency bandpass filter realizes frequency change by same phase channel；
The main control module control signal generator generates the cosine signal with Larmor frequency, using 90 ° of phase shifts
Device is converted to sinusoidal signal, which believes as the output of reference signal and bandwidth 200Hz regulable center frequency bandpass filter
Number frequency change is realized by orthogonal channel；
The main control module acquisition extracts ground magnetic resonance signal with the signal in phase channel and orthogonal channel.
2. device described in accordance with the claim 1, which is characterized in that the device further include: LC matching network and preposition amplification
Device, the LC matching network receive the magnetic resonance signal of receiving coil, and realization resonance is to improve signal amplitude, and it is dry to suppress noise
It disturbs；
The preamplifier carries out first time amplification to via LC matching network signal, and amplified signal is transmitted to band
Wide 200Hz regulable center frequency bandpass filter.
3. device described in accordance with the claim 1, which is characterized in that the same phase channel includes the first multiplier and the first low pass
Filter forms orthogonal vector type lock-in amplifier and with phase two-stage amplifier, reception bandwidth 200Hz regulable center frequency band
Bandpass filter, while being connect with the signal generator, the cosine signal and bandwidth 200Hz regulable center frequency of Larmor frequency
The output signal of bandpass filter realizes frequency change by the first multiplier, eliminates high frequency division using the first low-pass filter
Amount and most of noise, are further amplified by the same phase two-stage amplifier.
4. device described in accordance with the claim 1, which is characterized in that the orthogonal channel includes the second multiplier and the second low pass
Filter forms orthogonal vector type lock-in amplifier and orthogonal two-stage amplifier, the cosine signal with Larmor frequency, warp
It crosses 90 ° of phase shifters and is converted to sinusoidal signal, the signal is as reference signal and bandwidth 200Hz regulable center frequency bandpass filter
Output signal frequency change is realized by the second multiplier, eliminate high fdrequency component and major part using the second low-pass filter
Noise is further amplified by orthogonal two-stage amplifier.
5. device described in accordance with the claim 1, which is characterized in that described device further includes A/D capture card, the main control module
The acquisition of A/D capture card is controlled with the signal in phase channel, collects the initial data in same phase channel；It controls A/D capture card and obtains and lead to
The signal in road collects the initial data of orthogonal channel.
6. device described in accordance with the claim 3, which is characterized in that first low-pass filter uses cutoff frequency for 20Hz
Low-pass first order filter.
7. device according to claim 4, which is characterized in that second low-pass filter is all made of cutoff frequency and is
The low-pass first order filter of 20Hz.
8. a kind of ground magnetic resonance signal rapid extracting method based on phase lock amplifying technology, which is characterized in that the method packet
It includes:
The magnetic resonance signal that underground water generates is incuded by receiving coil；
For magnetic resonance signal via bandwidth 200Hz regulable center frequency bandpass filter, the centre frequency is Larmor frequency；
The cosine signal with Larmor frequency is generated, which can as reference signal and bandwidth 200Hz centre frequency
The output signal of adjusted band-pass filter realizes frequency change by same phase channel；
The cosine signal with Larmor frequency is generated, is converted to sinusoidal signal using 90 ° of phase shifts, the signal is as ginseng
The output signal for examining signal and bandwidth 200Hz regulable center frequency bandpass filter realizes frequency change by orthogonal channel；
The signal with phase channel and orthogonal channel is acquired, ground magnetic resonance signal is extracted.
9. according to the method for claim 8, which is characterized in that the initial data formula with phase channel is expressed as
When acquisition time is greater than 10ms, exp (- t/T2*)>>exp(-ωcT), the initial data formula in the same phase channel of acquisition
Abbreviation is
Logarithm is asked to above formula, obtains linear equation
T is sought by linear equation slope k2*=- 1/k, then linear equation in two unknowns is obtained by the vertical intercept I (0) of linear equation:
Similarly, a linear equation in two unknowns of the orthogonal channel obtained:
Q (0) is the vertical intercept that orthogonal channel seeks the linear equation after logarithm, and simultaneous formula (4) and (5) are established equation group, sought
Initial amplitude E0And phase theta.
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